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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac188f2f3ba2482107dc37801a6e99448bac14870121dba83c852473525d92e6' 
  AND token = '+LigdgdVZfJrgbP2NfR91OBcABG5i9sSoSVev8ljXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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