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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4ea878476241f3449674bf6d3ee3668871f4c1df0d02f014454e0c52514439' 
  AND token = 'HuyrGv1Y2nlRGG79fUn1CGA2f3cW6ZEA/m2t8v/tNKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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