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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfb6754d120f81918e4464a398baaf0d02bd1bf7e8735d95dfee1b7e7dd0ad5' 
  AND token = 'v0ianGiWK0vZYhLh0SDIJtzljzx4v22+nPmfWcA76lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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