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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36eac998abb45447f66a5014b86750fd64e09003eb282a2a420ade36c9c199af' 
  AND token = 'w7lzbdcCHEMbKLq669A34O2KlsjYLOsSF/ueY4NvVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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