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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149393515c67e39a1c68d6b0518de4249b73e4fdd6c291ee6fb0d64a0f103935' 
  AND token = '70/CNnZAbKVEdvygMIM1fcdqP0Ot2zuqF7Pp1LqjNJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}