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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2760bf0dacad3f5166372b755b4b7006007b84c040aabcc6a6c2238f0974d94c' 
  AND token = 'yuB1+q973QfcocSyuCWCzL2+CV3ln6Vni9FXWQSRMqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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