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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023542afa2002f69ac039e1bee414b54b001349d3cde9733ae0a17e57a527425' 
  AND token = 'HE76z+LUv4mbChq3+IrK9oeC7gyITlmyGOcr+BZd8qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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