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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37bf5043072d9f1bea7faf5fcea1fcea4cff1336e9b3ea80daa12a8f7d7b0bd' 
  AND token = 'Pw4091OsRa09XiN4BtlCoKYvcEt6YJc0k4pYVtxnawI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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