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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82d6f4bd311c4ed12647b8938a04bf6a5e7ded0f7f5d4e80ad5390b1d3e0dec' 
  AND token = 'FNQuNfKEvpJDsjDiqsAFAD1QsEzqPJi4Dn9wfAw06HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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