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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee25a15a3ed5b7c426f454bebd57b50bbca78cf4f79427886a2be407c39802df' 
  AND token = 'npNHm7tMa1mPgR17Nvh5LcwVB51hXYGLLVsr7ZIY76o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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