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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d3db7017a91f572d48c66bb309c6fcfb2027521af4668abce5af46a1f30ba0' 
  AND token = '7ODEH/2akxO2mtN+5kX2BaZLohiFJ/7zANxNn05VDJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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