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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de08a3438b9256cd48bddf8bdf4b0e0f134f0e8fb9841e818ebe08c4888a094' 
  AND token = 'psGl54npbyz6sEnAAHilTVBcbF4ZZeROfLRDSq+iXSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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