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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87efa3a87cf4d0fa775e99cf022f0ccd9a4bf11df264ac7ac16ac05ff58e174' 
  AND token = 'gR/GkzlHbpSV0YGG1SpX8WMwP6f7pz4+InNiJWcl5Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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