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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a980d865229c3b63e231d3ceefaa3b6e6cf8240f5c04a12e3aec8b83359458d3' 
  AND token = 'f3YmYjxjKHf5boojCVFiAIAho9k//xmHgPRQ37wSlcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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