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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a5a0ad92f513bafc5ccbf415bf4484a9e734b6cf3bc1202744c32269475d05' 
  AND token = 'AhKkkCCGEe594yj5N/zAHajAji6YKDacDS5JqWgR/O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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