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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7343cfcac4b20f297f9dcdd3e538fdda2a0848c84fe05a3513f0f21a3c044bf8' 
  AND token = 'VRZHq7H/bpNoC1VY14lake22HgASKK/Q46oZK72JFI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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