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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46520f7e70463de8f2b4908354e0131c543d84fea4b2e3abbc9acf91b4dc1c8d' 
  AND token = '4Mx5MGxPkxupv37WcGC50yf7ClwztVZPvivwMBejLOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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