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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2528bc96e529aed52966bc9ed2887c736e6ab91eba53b58678388b0b1d99078' 
  AND token = 'zya3Dl7IcvbqZyNRAEMGTlpgkv23eLCH0p8W7e41CbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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