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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5b7ae345fb449f24f2407dd481502c6a7a3b4d13cd71e7b46d54731b741842' 
  AND token = 'S9sH/2G86LOzzPSri5qJgffrz2bw5ZlAFEEjynpsEpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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