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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adc7e6f3c877e24039a56e9b7aa698ab32021fa52b5fd0260e925e6a9d30f7c' 
  AND token = 'xla3SZU3F46FibBlSVX271EHPTfCrG6pXIfK7VC7Hog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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