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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9dd7c42c5758d9cc4e7fecd0067f9b588dfec05c57850e36436157ec7eb38d' 
  AND token = '7N6IdOCA/w49MT5rEqoShpEO7dHS5uf7JTtkJ4BsPkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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