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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d617eb60d03e2db0a9fdd3e8cf61631e325b2e92f8c48175ee7f08dc2681498' 
  AND token = 'iAURCaSSIfNd+SaeovVAp7ioueYiryuGVBp2SAvRiSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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