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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5ab893e072df7f9793e3dd89fd37200f0c10b95c3c8ee99116ad16b9d8788a' 
  AND token = 'LaTVsnGuH7nb66M9mzH03dN+aTvkMYDy3z6tt6tBbw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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