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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35dc1e49c537b02356e266afbc38c9eb6e104e952fed479d0406ef78a6ac0ab1' 
  AND token = 'GgcOwhfKX0e0tCjonEMS1vBEQHUpoLvcGr+6H4TCA4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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