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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1a69ba8cd482767a15d02b22731e2d3c787926262bed6dc5e03ff4c664584d' 
  AND token = '4FEC9i4O94Rujr4VT6dDotqpCjTJJMlsEgR7idurY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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