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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b075ec3bcc0cf3e11537f706776513af18ad6ea4f15e58001b046e53274873e4' 
  AND token = 'FTkhpqfzzTJoidrHyk6PtU89go84aQnAzH2+9fDjnGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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