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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd894868a790b47b6c34705a2e3e2fc03b5c32a0bf6069a9faa29af223fa74b' 
  AND token = '7mN4skvjIAKWFBLKVLCNLcj4nmYUScGFS53867TLlHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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