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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '222d36b7a8f03932c503ddfafc46663d791f9c92d80ac8a435c9176fadd16e12' 
  AND token = 'Vru0DHTS2FWmzmxlUanZcKh7HcmXpPW1MbJXExK5md4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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