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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1afda868f7eb1219d590c396084d63ca116b6ea9c44793841306fd7dcfaad4' 
  AND token = 'U18kdOhw6GHeFd1Let/QMlCBDj2ELu6jnzi+oCl7+rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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