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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3545e6d74abf98282c1ea09c4a8b4996836f8be2c53a105608892cd0d1d1e1f' 
  AND token = 'QEP6nEH5J+kJLSl+KDDl9HQgEbtSgjJ0lGXCn7A7roY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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