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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7319df4b82c956c652ae9920ad192b9f1b7a0dc38b0cb6b7ad575b1ff863f764' 
  AND token = 'h0dR0DxJAHktOPdJ1efLq3lSRq2NV/eVBhvIbFxnfy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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