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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d4bf17b403db0448800c33bf26f77b1345acd35c11c445a624356fb4845b78' 
  AND token = 's2SHIzQMUh2XSOt8G8mLl3+0geO9PMHHHz4h4MA7dHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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