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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfdfda969bf10ed69a1762581b72fb352039106c4c8fcc52363233f855505a4' 
  AND token = 'foJWAsfdM0EdhoQM6TrX5BKx4AvZ7Y0y6xQA6t5RB20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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