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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c87c69e0ff40599a758a27492a2fe72635cb3051c4f69f4626008ba3a377fe1' 
  AND token = 'nTzD55xC9ME1SPQndIWKEWgjPoGADj3n9wR5GMDI6rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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