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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f3b58c9f3649a9f8ffcd9d52634185b6bfaf837fcb776bd50d0a08ea83836f' 
  AND token = 'zb+rR29HS6oZUS2T3RILpj0uqmlpZP2b8ycC+j/XynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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