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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cc3919edce51dc9b8d3b9b43f0b0fad0c9bc37aa21ee34bbcb25cf90d65ea9' 
  AND token = 'XYsV5TVG2MV2OKzu2pDnCzx+KemKRROxwN+icR2KRBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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