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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931daf7257c3aad614e1be2811635f9fdb11dfe02a969b877f18136f6635011e' 
  AND token = 'dFMuMjA9I27V4+zOj3AhUJVZjRpokBg01iJUnyb8aA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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