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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db14aed1b6f2b4bd45a0a05815ad7a6f5bd99db0a9577e0c7150a013e262b0a' 
  AND token = 'AFgvFQUwXBCObXVSamS+gw/glidWqUqWWZ0LJGR/g+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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