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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c89cb28495e6357c2a531936e469a0b98b711f76a6210b29f0e5119cdaedf9' 
  AND token = 'iCkxG21iTA1Oo2SPhhu3z2O79bUm7Yc948q2z/IN8lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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