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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5ceadb0ed34a61d89afebb89492b2c92666f5af516249b84250c713fcbcd87' 
  AND token = 'cffIJSIIbnMdl8ekR6jHDPQK7ouAy1oh/WuCDXC7JP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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