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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f669c35e8b4c8cebda0bedf178488e3809e4ccc56b31db1587e582928ec981' 
  AND token = 'yhDQi3aR13PI75tD2czxUsPu5cgd3DXkavAOMH+xcEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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