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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2d5bb183374615495e1aff0e4e648b4e571849471b71de0d2e47c6eabad115' 
  AND token = 'G3aTkTpeopCx7v3vfyM26zT2L5/rPw3NWvTCfXhwoDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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