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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0c5e3b9bdb4a909e8a811585b59d9f8dbe925fe38245428a1a0a5be46abd20' 
  AND token = 'NKnkD1GhgaduLx+KWKXFM4puuo2XTAWfaciNNjeXrWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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