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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bb047621f1230d3ade75aebdb3d4b0f651331b6bba01ffc33cea65e63367f3' 
  AND token = 'CsDNEycaw2BhDX2Bi3Ke2hmQd9ovrMpTSSuKyxYkiqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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