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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8ac0834de8ba5d7f4a32f15c901cd4c7bb1f063bf1b545686051bbec657876' 
  AND token = 'SCGl2xe+2fFkEFMAyogJm4JWrpw2AIH882g4L716fMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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