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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2060a40091c091c28efb9e24731c6dd3ea625a3a46e1b018e051ed730b877b' 
  AND token = 'pFKyYW6oKh4+IhPoHDBjokuAZsaraaowmh9dPnUMi0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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