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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d3b7db04675c3351f08688baac7acf52179a5ae4e2283d96eb7c662483f618' 
  AND token = 'V0MtZdQ6nYOELA/7BTckmmRQxtXm2vIITUP3Cj6p/Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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