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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4deb3ebd7f2db597361d2cd4cd71576da51c65f2f005ddd536ec5a4904ded95a' 
  AND token = 'wFwbMlLO4mJLugep2dQPFomV7ExtxV6pX2n9fEchv+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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