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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d4bcdb4bbbb7e902b047940fa14157c2b8b96be88b70c10132249338f7d0e6' 
  AND token = 'J3NL2n9DGBTQB33rJ5Q8d5Kok0bnvO8Vm1dDMm68hpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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