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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f83c3f7e03d8c931ef828d5d20ede2877d7ab4365f1bf3ee3079579412329e' 
  AND token = '4PBX+dKhZIHL8g6FH7Ln1oEIJg1yZic/hC78rM7buvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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