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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb095e5ec734c8016f9a6fb3c4f72bcb45d731e9955305db5f78bf450579e982' 
  AND token = 'bXPNyHetOigfxtnEi68Zc6LhU1C+lq9+9As3sDgMGyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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