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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2231385eb7cb728975cebfe1cba71a24f5ba259f30679cc84b2a5d1ae2cfd22' 
  AND token = 'hBYveSzr81uedO8+hLOiGwgfafV0SZtVVPBK6M4S0gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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