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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7824d9d038a5951048739f8ceb2c7984eddccb50068845ef57fbc643066bb8a2' 
  AND token = 'MWwjAVmOSnOLMk7h26nz4eyR/1HqqGfaE/UwmsEHG2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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