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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def13632eddbf3c065b945923f4939bcd6b9631c65a31b4c4883008bef0e2562' 
  AND token = 'gfwx8r0odjsUOWkKIW0eNwRtbY+11k2DtNyxxPKo3NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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