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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3152b15905b70976e9201da3a49901ce992c64545a906f85df1daa0ea961993' 
  AND token = 'mR0rlVxCi9gmpqf/RoqNAn4tEcn88RwK8vTUEYdwkLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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