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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999221b8b24d3ff9033423c97e6e263458ddb035830492a6a30a1204e304df97' 
  AND token = 'EgKxYd3erKZJ2y9zUcGR+eeP5MidZRpqmnhbWkozeEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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