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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068c7f9b86230060726a06f3795ba1fe5b650ebeced02c53855b1f658f584d97' 
  AND token = 'gQaRDDUlcEwHKih7/g52UQnGNlkAeGrej0TX9MhCRhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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