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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da300e6f6fa640ee0f62da52caeb6027c53f40caa60c15f84984a234c6ef71e2' 
  AND token = 'cFGKQP6c7qxlncQGehlISxJzi6MKc1H2v+4FYTnlHQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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